Floating style bridges are simply a fact of balance. The tension caused be the strings needs to be equal to the tension of the springs. Considering that, I seriously doubt there is anything really wrong with your guitar.
Obviously, the tension of the strings on your guitar is quite a bit higher than the tension of those three springs combined, which is why the bridge is tilted up that way. Luckily there's an easy fix to this, all you have to do is put in an extra spring in the back, or maybe even just replace the three springs that are in there now with three new ones. These springs tend to vary in strength, and even lose their strength after some period of time(I know folks who replace their springs once a year), so replacing them might add the extra tension that is needed.

I went from .009's to .011's on my seven string, with that change of gauge I had to add 2 extra springs to my bridge. So, I'd say it's very likely you just need an extra spring in there.

[Edited by SPL on 10-25-2003 at 01:04 PM]